Bring the .Nx (NetBSD) macro into line with NetBSD's version.
Bring the .Nx (NetBSD) macro into line with NetBSD's version.

Add the .Ox (OpenBSD) macro from OpenBSD.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase